/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.scene;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;

import java.util.Random;

/**
 * 基于HLL实现点击量计数
 *
 * @author lw1243925457
 */
public class HyperLogLog {

    public static void main(String[] args) {
        try(JedisPool jedisPool = new JedisPool(); Jedis jedis = jedisPool.getResource()) {
            String key = "HyperLogLog";
            jedis.del(key);

            for(int i = 0; i < 10000; i++) {
                long userId = new Random(System.currentTimeMillis()).nextInt(100000000);
                jedis.pfadd(key, String.valueOf(userId));
            }

            System.out.println("click amount: " + jedis.pfcount(key));
        }
    }
}
